Measurements of. amplifiers. Unofficial measurements performed at ETF2009 by Jean Michel Le Cléac h
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1 Measurements of Output Transformers for 300B Single End amplifiers Unofficial measurements performed at ETF2009 by Jean Michel Le Cléac h aside the shoot out out of OPTs for SE 300B amplifiers
2 Schematic of the measurement set up Modified by Jérôme Falampin after a schematic by William Walther
3 All measurements were performed after calibration of the output t level lat 2volts RMS on 8 ohms at 1000Hz ( P = 0,5 watt ) Please note the 1.1dB 11dBvertical scale used for the frequency response curves in order to amplify the difference between transformers. Due to the unavailability of an oscilloscope the first day of the measurement, several OPTs could not been tested under 10kHz square waves. For frequency response and distortion measurement a sound card at Fs = 96kHz was used. (Pulse response retrieved fromlogsweep + convolution: Angelo Farina s method.) Frequency response spectrums were truncated before bf the frequency at which the antialiasing low pass filter of the soundcard begins to operate. (please note: coma replacing decimal point tin tables) tbl
4 Transformer N 1, Højbjerg Karsten, toroidal transformer in cardbox Frequency response (N 1 = red, blue = reference) 7,8 9,9 8,9 8,7 8,4 9,3 8,8 5,8 0,0 3,8 10kHz square wave
5 Transformer N 2, Terrell Brian, SE Output transformer Frequency response (N 2 = red, blue = reference) 7,6 8,6 9,1 8,2 8,7 8,8 8,7 4,9 6,9 5,6 10kHz square wave
6 Transformer N 3, Falampin Jérôme, Bouyer ST10 transformer (in soap box) Frequency response (N 3 = red, blue = reference) 0,0 4,7 9,5 3,2 1,8 1,6 1,7
7 Transformer N 4, Sullerot Julien, James JH2123 Frequency response (N 4 = red, blue = reference) 9,3 9,8 8,7 9,3 6,3 5,3 5,9 8,1 6,6 7,6 good frequency response 10kHz square wave
8 Transformer N 5, Falampin Jérôme, unknown semi pro vintage transformer (in tea box) Frequency response (N 5 = red, blue = reference) 4,9 4,6 8,4 5,4 4,8 3,5 4,3 8,1 1,0 5,7 10kHz square wave
9 Transformer N 6, Sullerot Julien, Partridge TK 4519 Frequency response (N 6 = red, blue = reference) 9,5 9,9 9,7 9,7 8,8 7,7 8,4 6,7 7,4 6,9 excellent frequency response. low distortion. 10kHz square wave
10 Transformer N 7, van der Veen Menno, toroidal SE OPT Frequency response (N 7 = red, blue = reference) 8,9 9,9 8,9 9,2 7,6 7,1 7,4 very ygood frequency response.
11 Transformer N 8, Le Cléac'h Jean Michel, Magnetics (special order) Frequency response (N 8 = red, blue = reference) 8,3 9,3 7,7 8,5 6,0 5,0 5,6 9,7 9,6 9,7 Excellent square wave response 10kHz square wave
12 Transformer N 9, Michimori Hirokuni, ex Tango #10887 (special order), rating 50W, 3.5K Frequency response (N 9 = red, blue = reference) 9,4 8,9 10 9, ,6 9,1 8,8 excellent frequency response. best distortion performance. good square wave response. 10kHz square wave Compare with N 20
13 Transformer N 10, Sullerot Julien, Tamura transformer from a Sun Audio 2A3 amp Frequency response (N 10 = red, blue = reference) 8,1 8,8 7,0 8,1 6,4 4,8 5,7 8,1 10,0 8,7 excellent square wave response 10kHz square wave
14 Transformer N 11, Weidhase Ulf, One Parafeed Transformer 3k5 /8 Ohm Frequency response (N 11 = red, blue = reference) 8,4 8,9 8,0 8,5 5,4 7,3 6,2
15 Transformer N 12, Le Cléac h Jean Michel, Meigxu from a Mingda SE amplifier Frequency response (N 12 = red, blue = reference) 6,7 9,3 9,5 8,0 4,4 4,2 4,3 5,7 7,8 6,4 10kHz square wave
16 Transformer N 13, Polisois Aristide, DIY grey large transformer Frequency response (N 13 = red, blue = reference) 2,1 8,4 8,0 5,2 5,9 8,6 7,0 0,0 3,6 1,2 10kHz square wave
17 Transformer N 14, Raudonat Ralf, yes, with output transformer regarding the terms Frequency response (N 14 = red, blue = reference) 7,7 7,5 6,4 7,4 8,9 8,2 8,6 8,2 9,0 8,5 10kHz square wave
18 Transformer N 15, Hasling Per & Ole, SE Silk transformer from Tailand 3,0 kohm Frequency response (N 15 = red, blue = reference) 6,7 8,8 9,5 7,9 6,3 5,5 6,0 8,3 9,5 8,7 very good square wave response 10kHz square wave
19 Transformer N 16, Dolinskyi Arkadii, DIY EI transformer Frequency response (N 16 = blue = reference; 24 for comparison) 9,4 9,9 9,9 9,7 8,1 8,5 8,3 excellent frequency response. low distortion.
20 Transformer N 17, Weidhase Ulf, Transformer Frequency response (N 17 = red, blue = reference) 4,2 8,7 6,1 6,0 3,4 0,0 2,1
21 Transformer N 18, Schwarz Andreas, a selfmade single ended output transformer Frequency response (N 18 = red, blue = reference) 9,2 9,6 9,7 9,4 5,2 7,2 6,0 excellent frequency response. Low H2 distortion.
22 Transformer N 19, Polisois, Aristide, DIY toroid transformer Frequency response (N 19 = red, blue = reference) 0,3 0,0 0,0 0,2 1,9 0,8 1,5 7,0 5,0 6,4 10kHz square wave
23 Transformer N 20, Le Cléac h Jean Michel, Tango FX3.5 Frequency response (N 20 = red, blue = reference) 8,5 9,8 8,5 8,9 7,9 8,8 8,2 9,1 9,3 9,2 very good square wave response 10kHz square wave Compare with N 9
24 Transformer N 21, Falampin Jérôme, DIY parafeed transformer Frequency response (N 21 = red, blue = reference) 1,0 4,7 2,9 2,6 0,0 0,4 0,2
25 Transformer N 22, Weidhase Ulf, transformer Frequency response (N 22 = red, blue = reference) 6,7 7,5 9,6 7,5 9,4 9,1 9,3 very low distortion ti
26 Transformer N 23, van Willenswaard Peter, AudioNote Trans 300 double C core Frequency response (N 23 = red, blue = reference) 8,7 6,5 6,5 7,6 6,2 5,3 5,8
27 Transformer N 24, Hubertse Rob, custom made OPT by AE Europe Frequency response (N 24 = red, blue = reference) 9,5 9,9 9,6 9,6 9,5 5,9 8,0 10,0 9,7 9,9 excellent frequency response. low H3 distortion excellent square wave response 10kHz square wave
28 Transformer N 25, Le Cléac h Jean Michel, small and old Audionote Frequency response (N 25 = red, blue = reference) 6,7 9,1 6,4 7,5 6,3 5,3 5,9 9,1 9,6 9,3 very good square wave response 10kHz square wave
29 Transformer N 26, Monmagnon Yves, Dissident Audio transformer Frequency response (N 26 = red, blue = reference) 9,4 8,6 4,8 8,4 6,8 5,5 6,3
30 Transformer N 27, Pierre Francois Brand, transformer Frequency response (N 27 = red, blue = reference) 6,1 8,7 7,3 7,2 5,5 4,7 5,2 9,3 8,1 8,9 good square wave response 10kHz square wave
31 Transformer N 28, Pierre Francois Brand, transformer Frequency response (N 28 = red, blue = reference) 9,6 9,6 7,8 9,3 7,3 4,6 6,2 good frequency response
32 Transformer N 30, Lundahl Per, LL1693/70mA Frequency response (N 30 = red, blue = reference) 10,0 10,0 9,8 10,0 9,4 9,5 9,5 The best frequency response. Very low distortion.
33 Transformer N 31, Lundahl Per, LL1664AM/70mA Frequency response (N 31 = red, blue = reference) 8,7 10,0 8,1 9,0 8,5 3,8 6,6 good dfrequency response
34 transfo owner model and/or description width flatness symmetry y weighted H3 H2 weighted 1 Højbjerg, Karsten toroidal transformer in cardbox 7,8 9,9 8,9 8,7 8,4 9,3 8,8 5,8 0,0 3,8 2 Terrell, Brian SE Output transformer 7,6 8,6 9,1 8,2 8,7 8,8 8,7 4,9 6,9 5,6 3 Falampin, Jérôme Bouyer ST10 transformer (in soap box) 0,0 4,7 9,5 3,2 1,8 1,6 1,7 4 Sullerot, Julien James JH2123 9,3 9,8 8,7 9,3 6,3 5,3 5,9 8,1 6,6 7,6 5 Falampin, Jérôme Unknown semi pro vintage transformer (in teabox) 4,9 4,6 8,4 5,4 4,8 3,5 4,3 8,1 1,0 5,7 6 Sullerot, Julien Partridge TK ,5 9,9 9,7 9,7 8,8 7,7 8,4 6,7 7,4 6,9 7 Veen, van der, Menno toroidal SE OPT's 8,9 9,9 8,9 9,2 7,6 7,1 7,4 8 Le Cléac'h, Jean Michel Magnetics (special order), 8,3 9,3 7,7 8,5 6,0 5,0 5,6 9,7 9,6 9,7 9 Michimori, Hirokuni ex Tango #10887 (special order), rating 50W, 3.5K 9,4 8,9 10 9, ,6 9,1 8,8 10 Sullerot, Julien Tamura transformer from a Sun Audio 2A3 amp 8,1 8,8 7,0 8,1 6,4 4,8 5,7 8,1 10,0 8,7 11 Weidhase, Ulf One Parafeed Transformer 3k5 /8 Ohm Transformer 8,4 8,9 8,0 8,5 5,4 7,3 6,2 12 Le Cléac'h, Jean Michel Meigxu (Mingda), 6,7 9,3 9,5 8,0 4,4 4,2 4,3 5,7 7,8 6,4 13 Polisois, Aristide DIY grey large transformer 2,1 8,4 8,0 5,2 5,9 8,6 7,0 0,0 3,6 1,2 14 Raudonat, Ralf yes, with output transformerregarding regarding the terms 7,77 7,5 6,4 7,4 8,9 8,2 8,6 8,2 9,0 8,5 15 Hasling, Per + Ole SE Silk transformer from Tailand 3,0 kohm 6,7 8,8 9,5 7,9 6,3 5,5 6,0 8,3 9,5 8,7 16 Dolinskyi, Arkadii DIY EI transformer 9,4 9,9 9,9 9,7 8,1 8,5 8,3 17 Weidhase, Ulf Transformer 4,2 8,7 6,1 6,0 3,4 0,0 2,1 18 Schwarz, Andreas a selfmade single ended output transformer 9,2 9,6 9,7 9,4 5,2 7,2 6,0 19 Polisois, Aristide DIY toroid transformer 0,3 0,0 0,0 0,2 1,9 0,8 1,5 7,0 5,0 6,4 20 Le Cléac'h, Jean Michel Tango FX3.5 8,5 9,8 8,5 8,9 7,9 8,8 8,2 9,1 9,3 9,2 21 Falampin, Jérôme DIY parafeed transformer 1,0 4,7 2,9 2,6 0,0 0,4 0,2 22 Weidhase, Ulf Transformer 6,7 7,5 9,6 7,5 9,4 9,1 9,3 23 Willenswaard, van, Peter AudioNote Trans 300 double C core 8,7 6,5 6,5 7,6 6,2 5,3 5,8 24 Hubertse, Rob custom made OPT by AE Europe. 9,5 9,9 9,6 9,6 9,5 5,9 8,0 10,0 9,7 9,9 25 Le Cléac'h, Jean Michel small and old Audionote 6,7 9,1 6,4 7,5 6,3 5,3 5,9 9,1 9,6 9,3 26 Monmagnon Yves Dissident Audio transformer 9,4 8,6 4,8 8,4 6,8 5,5 6,3 27 Pierre Francois Brand Transformer 6,1 8,7 7,3 7,2 5,5 4,7 5,2 9,3 8,1 8,9 28 Pierre Francois i Brand Transformer 96 9,6 96 9,6 78 7,8 93 9,3 73 7,3 46 4,6 62 6,2 30 Lundahl, Per LL1693/70mA 10,0 10,0 9,8 10,0 9,4 9,5 9,5 31 Lundahl, Per LL1664AM/70mA 8,7 10,0 8,1 9,0 8,5 3,8 6,6
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